table.dataTable.table-sheets
{
    border-spacing: 0!important;
    border-collapse: collapse!important;
}
.table-sheets tr td
{
    border: 2px solid #E4E7ED;
}
.table-sheets tr th
{
    text-transform: uppercase;
    color: #3D3D3D;
    background: #E4E7ED;
    font-size: 14.70px;
    line-height: 17px;
    border-left: 2px solid #fff!important;
    border-right: 2px solid #fff!important;
}
.table-sheets tr:first-child th
{
    border-left: 2px solid #E4E7ED!important;
}